"My son is laid-back like me," Cannon, 30, told Us Weekly Tuesday at the Mercedes-Benz Gala opening in New York. "My daughter's a diva like her mom!"

How can the first-time dad tell already that his baby girl is a diva? "When my daughter wants something, she'll let you know immediately," he laughed. "With [our son], you kind of feed him when you get around to it, and he's OK with that."

The "America's Got Talent" host said he and Carey, 42, split diaper duty pretty evenly. But Carey is much better at the dirty task. "My diapers tend to leak," Cannon admitted.

So, just how is Cannon's Grammy-winning wife adjusting to motherhood? "She's amazing," he gushed. "She's the best mother ever."